expm1
(PHP 4 >= 4.1.0, PHP 5)
expm1 — Returns exp(number)  1, computed in a way that is accurate even when the value of number is close to zero
Description
float expm1 ( float
$arg
) expm1() returns the equivalent to 'exp(arg
)  1' computed in a way that is accurate even if the value of arg
is near zero, a case where 'exp (arg
)  1' would be inaccurate due to subtraction of two numbers that are nearly equal.
Parameters

arg

The argument to process
Return Values
'e' to the power of arg
minus one
Changelog
Version  Description 

5.3.0  This function is now available on all platforms 